Leppänen M T, Postma J F, Groenendijk D, Kukkonen J V, Buckert-de Jong M C
Department of Biology, University of Joensuu, Joensuu, 80101, Finland.
Ecotoxicol Environ Saf. 1998 Nov;41(3):251-7. doi: 10.1006/eesa.1998.1705.
A method was developed for monitoring the feeding activity of larvae of the midge Chironomus riparius. The egestion rate (mg dry wt feces/mg dry wt larva/h) of the deposit-feeding larvae was measured and used as an indication of the feeding activity. Both the egestion rate and survival of several metal-adapted and reference larvae were measured in five test sediments with various Cd and Zn concentrations. The reference larvae suffered increased mortality in two contaminated sediments by comparison with field-exposed larvae. The feeding of all individuals decreased in the most polluted test sediment but also in another supposedly clean reference sediment. No differences were found in egestion rates between the reference and field-exposed larvae. This observation, however, does not reliably answer the hypothesis whether the feeding activity of the adapted and nonadapted midge larvae differs in metal-contaminated sediments because the data are based on total egestion during the short (96-h) experiment and the progress of feeding was not followed.
开发了一种监测摇蚊幼虫摄食活动的方法。测量了沉积取食幼虫的排粪率（毫克干重粪便/毫克干重幼虫/小时），并将其作为摄食活动的指标。在五种镉和锌浓度各异的测试沉积物中，测量了几种适应金属的幼虫和对照幼虫的排粪率及存活率。与野外暴露的幼虫相比，对照幼虫在两种受污染沉积物中的死亡率有所增加。在污染最严重的测试沉积物以及另一种据称清洁的对照沉积物中，所有个体的摄食均减少。对照幼虫和野外暴露幼虫的排粪率未发现差异。然而，这一观察结果并不能可靠地回答在金属污染沉积物中适应和未适应的摇蚊幼虫摄食活动是否存在差异这一假设，因为数据基于短时间（96小时）实验中的总排粪量，且未跟踪摄食过程。
